Key equipment, two additional key fobs

Years 2019–20, 2023, 2025–27 Models 3 Factory citations 17

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Also described as Key equipment, two additional keys for single key system

Also documented for Buick Chevrolet

Documented applications

Savana — GMT610 (2003–2027)

2023, 2025–2027 Factory-verified

O: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT

GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.12.
GM factory document — 2025 gmc savana cargo fleet order guide, p.38.
GM factory document — 2025 gmc savana cutaway fleet order guide, p.46.
GM factory document — 2025 gmc savana passenger fleet order guide, p.30.
GM factory document — 2026 gmc savana cargo fleet order guide, p.40.
GM factory document — 2026 gmc savana cutaway fleet order guide, p.50.
GM factory document — 2026 gmc savana passenger fleet order guide, p.31.
GM factory document — 2027 gmc savana cargo fleet order guide, p.37.
GM factory document — 2027 gmc savana cutaway fleet order guide, p.26.
GM factory document — 2027 gmc savana passenger fleet order guide, p.29.

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

only in: 2500 HD and 3500 HD pickup; provides two spare key fobs for a total of four; programming is at the customer's expense

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Sierra — T1XX (2019–2026)

2019–2020, 2025–2026 Factory-verified

the 2019–2020 lists read "Key, single key system, 2 spare keys"

GM factory document — 2019 gmc 19 sierra 1500 body builder feb 20, p.9.
GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.9.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of 5H1 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.